How to Make Peanut Butter Harden

Whether you want to roll your peanut butter into spheres or you're storing peanut butter-topped fruits in the fridge, hardening your peanut butter contains the spread and minimizes the mess. Fortunately, peanut butter producers create this nutty and nutritious spread with smoothness and congealing in mind. During the manufacturing process, companies crush and heat peanuts to over 160 degrees Fahrenheit before mixing a small amount of hydrogenated vegetable oil throughout the peanut butter. The hydrogenated vegetable oil hardens, stabilizing the peanut butter as it cools in the jar and preventing the peanut oil from forming an oily layer on the surface.

Things You'll Need

Refrigerator

Peanut butter with hydrogenated vegetable oil

Waxed paper

Cookie sheet

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Shape or spread your peanut butter in the position you want it to harden. Spread the peanut butter on the bottom of a paper candy cup or pan to make peanut butter cups. Place balls onto a waxed paper-covered cookie sheet or dish if you are making peanut butter balls. Insert any toothpicks or decorations at this time, while the peanut butter is still soft.

Place your pan, sheet or plate inside the refrigerator or freezer. Place the platter in the freezer for an hour to create rock-hard peanut butter or store the plate in the refrigerator for 45 minutes for a firm to slightly hard consistency.

Tips & Warnings

Don't try to make balls from peanut butter unless directed to do so by the recipe. Molding traditional commercial peanut butter without additional ingredients, like butter or grain, is nearly impossible.